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getting alfa usb wifi to work with BT3 ?

Hey guys,
Be gentle. I have an asus eee with standard linux o/s. I run BT3 of a sd card and have used it with the built in atheros card to test my network using spoonwep etc.
Im looking for more range so have ordered the Alfa 500mw usb card. When it arrives is there anything I need to do, like when I put the atheros into monitor mode, is there a different sequence of things I need to do.
I've only just got to grasps with airodump,aireplay etc so give it to me like im really simple !

Received alfa unit this morning but when I plug it in when running BT3 it says new hardware found (wlan0) and asks me if I want to configure it, I click yes then it asks if I want to start wpa_supplicant for this interface, I click yes and it gives me a list of drivers to choose from.
But when I choose any of them it gives a "Kwlan was unable to start wpa supplicant" error. says it may be due to system configuration,please check and try again.
Any ideas ?
Also when using this card in backtrack can I also use as normal to connect to internet or is it only for injecting etc in BT ?

Received alfa unit this morning but when I plug it in when running BT3 it says new hardware found (wlan0) and asks me if I want to configure it, I click yes then it asks if I want to start wpa_supplicant for this interface, I click yes and it gives me a list of drivers to choose from.
But when I choose any of them it gives a "Kwlan was unable to start wpa supplicant" error. says it may be due to system configuration,please check and try again.
Any ideas ?
Also when using this card in backtrack can I also use as normal to connect to internet or is it only for injecting etc in BT ?

This behaviour sounds curious as I have never noticed anything of the kind when plugging in a wireless device.

The card can be used both for injecting and monitor mode as well as for connecting to wireless networks the normal way. However, the driver included in BT3 does not support WPA/WPA2 encryption in managed mode but for a fix take a look at this thread.